Re: [MBZ] 350sdl update

I think there must have been some failure at the hydraulic compensator / valve. Perhaps the hydraulic compensator jammed and broke apart, and that jammed up the camshaft so that the camshaft gear broke apart. If pistons touched valves, aren't those piston's associated bearings now also suspect?

Re: [MBZ] 350sdl update

Balls from the vacuum pump in the sprocket, jerking the chain, busting the cam sprocket, but normally the cam breaks and the sprocket survices. Dan Penoff via Mercedes May 21, 2016 at 4:15 PMvia Postbox

Re: [MBZ] 350sdl update

That is just way too clean. Must be a failed oil pump clay On May 21, 2016, at 2:10 PM, Kaleb C. Striplin via Mercedes wrote: > I removed the valve cover and this is what I find. Any theories as to what > would have caused this? > > > > > > > > > > Sent from my

Re: [MBZ] 350sdl update

This is what's responsible. https://www.youtube.com/watch?v=zzmS2oDMPc0 On Sat, May 21, 2016 at 9:19 PM, Peter Frederick via Mercedes < mercedes@okiebenz.com> wrote: > Then that's not what broke the cam sproket I would think. Usually an out > of time cam gets broken, but for sure the valves

Re: [MBZ] 350sdl update

Then that's not what broke the cam sproket I would think. Usually an out of time cam gets broken, but for sure the valves are bent and the guides are in need of replacement -- that was the damage on my brother's when the pin on the cam sprocket went adrift somehow and the sprocket slipped

Re: [MBZ] 350sdl update

2 of the lifters came apart when I assume the valves also bent. Those are probably internal parts of the lifters Sent from my iPhone > On May 21, 2016, at 6:58 PM, Peter Frederick via Mercedes > wrote: > > That is a stray part, for sure, but not from the valve train

Re: [MBZ] 350sdl update

That is a stray part, for sure, but not from the valve train that I know of -- bucket type tappets are under the lobes of the cam that cover the keeper and springs. Is there a bucket under there? Might be part of a tappet, but where is the "bucket"? Usually the cam breaks if something

Re: [MBZ] 350sdl update

Check the vacuum pump, if it sheds chunks it usually breaks the chain, but if the cam gear was bad, a suddenly locked chain could fracture it. Knocking before failure sounds more like a cracked camshaft sprocket though. I don't think this is a common failure Peter

Re: [MBZ] 350sdl update

Well there was something going on leading up to the failed that the PO nor the show was able to observe and figure out, instead they replaced a couple of injectors. The owner continued driving it until it quit completely. I have a complete #20 head with camshaft etc ready to go if needed. Need

Re: [MBZ] 350sdl update

Obviously further tear down is required to establish the failure path.. "Something" caused the cam to stop while the engine was under power.. certainly.. I can not conceive the cam gear simply "failed on it's own" from fatigue. More pictures as it comes apart please.. you have my interest here..

Re: [MBZ] 350sdl update

Valve hitting a piston? Seized camshaft? Man, that looks nasty. Looks like you might need a complete head with a cam. Rather catastrophic and not a good day for that engine. Dan > On May 21, 2016, at 5:10 PM, Kaleb C. Striplin via Mercedes > wrote: > > I removed